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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd4e13e74e8c392d8e6b42dddac59c75c819e1ab4a7a31dc001fe0b8254ecc9e' 
  AND token = 'wrYLhLIw9imP0i61LBS7m5q/RitDfjIT98dX2czvbUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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