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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9579787030dea01834011093036bf0d8b1e9a7235fd1f0a8165ba0765b1c882b' 
  AND token = 'TiWSn+FMqL9cgyH61XBazpvssDksI+wps+Uf/BYq2QE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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