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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '141dd053fd2675c3e394e69bf7ecb8b122d9b4808fc5250db67106f7dbd94ab0' 
  AND token = '/UqsEy01qmszdTKJa6WllrOF4RzkSVCvmq5mNoQ7C2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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