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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a856583498b2fc0cb18d03f125fd5d5c68637ea4a0500d010a17137a0a3bb906' 
  AND token = 'crbYlWwzF5NluHpIMbnJi9R9rLsz8EEPYMv0DcrJMqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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