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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1890903ac00013586241306daf60c9aa4c3253e6a7d63c55cd7923759706d2a8' 
  AND token = 'MCpfMDFpgoE+P79NlghqnP5ChyKVQtnTci+quE7n7yY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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