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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1584ab1f5ed43ffa9e8619d66c43d07a88e3cfbf0e23e4dd045d1f5ef35c430e' 
  AND token = 'OfRJqcB/vlY518udsAkfcvMFneU0NAHy2AP9YwK+mig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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