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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88bc54a9a27ece2a970967a68471a3781fa06f9c3dc93c9e38aecef2ff05fbca' 
  AND token = 'n3wv4Twnp5kzQOQ1y3BCrsCL3StJPKmY/QqioNr4GYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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