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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '552613122a9eff715e70d804e3280f626ed6f5b424f5a839050d352a4f58b38d' 
  AND token = 'sJPinu8a8Oy0mmqp+9n17P46fF7Yk5A2WYL93XjuORg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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