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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a31c3e74758bcf64c8a0057505c020dfbe337b0ebeb406c91158bfeb138c01' 
  AND token = 'NmXGpLCET9+tg5r4mEN/ialNxmWQWsXQXZomYtaOtw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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