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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b66b4f0047714aa6d0daa662440df088eb95735c04ac4400e1a89da412e2b0ad' 
  AND token = 'AdtgevBzZfz3JfAN2FMM4+PAOxki5wSCVHCPagRyDCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}