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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6a26bd11f740766ba9e18ea9bbdec0f29b0bfdac1079f955b9b006506e29bff' 
  AND token = 'UxKAwNy4Z3DGommrMWKoYv8V3J+g2TbBWXXAqkeOpKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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