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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c0cb963a9deb31857320e05b3e692361dd8009268f8d6fbdd8c1d3a03b6af19' 
  AND token = 'Z4dqyl6xifogKOEUlmTvaf/T+PkrtZXmLIGpDYyau5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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