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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5d7bdab0acd0c78a16aa346a650a33e43af908284efc19f07e54eb4f57ac808' 
  AND token = 'GDaA3EqSDInLaeoxPNuQp8slJCLQHOTphXljJUEbx3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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