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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0aea2ce049037cde74bf76f8a8f1e9b51fe8bed9cef64dd0787dd8aa282f7cd' 
  AND token = 'JzGdMJENqCiwVBLiWw8xcmY05rD4RH/YsYOBckhI1XA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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