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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1794d784f47224657b5ede88ce59206b2d48b1b23e2a12a0e956a8d9370fb77e' 
  AND token = 'nq0KLG6YAVa57hKb26J6yKAldXhpP2PMh0yeRWEP4Bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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