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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b547c8514382839de4c087bd7eff9fd45341427dfa0c87012abb02c2b6a6f5eb' 
  AND token = 'i75OfTud3OWYX7R1jSthQ/wkEdX9s9NOceFIa3ovV3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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