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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aab04123f1c6f94ce7fd87299a65abe172115fc18d1d2c567bbefe00d8c8ba5d' 
  AND token = 'e5mgPv6CegRTaClvpGLBxMav6zIsB3r2pIOHODgrJ1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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