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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '823aeb230639350d9ad5a8081f4d52bc07804f3514f5f8e3083b211f328bef5e' 
  AND token = 'AOHakZjHKbVTEQ7BGjc93C+LojiqJztqtKSNImOJ0IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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