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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73ab360c08a95572f3a81a48fd749f52de4ccb1ef82292d3915f2a5d36f02962' 
  AND token = 'onAgKG9fH+IJyr9AcDsga9AliHXkkAKnqNcil8cteDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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