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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b195ecffcdc5d50344deb979e01eaeb17c0258a974fad7d52a5cc88f191e8e8' 
  AND token = '5RnGtVzrTTKuiSEl1gj7v00lcsaAeo4a02wfVOaGC+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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