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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '870655e5fb93ade46979327fd8c654bb282e55cfc923d83d9bd584a35a61878d' 
  AND token = 'rQhTMDvzJ7rDirFTvhbP1g9fEn469/fan86dUHt1iV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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