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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b813394d8a19ceda0a5ca357b52b8e18c1e199cfb7a523a8135b4571e63efc9c' 
  AND token = 'PP6VY77ueFI8QKK4M5mllI5NGBywIWnlN4JjbyFxb/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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