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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0dfd94ac5eb29be4c55af404401102310d8bab564dbd044b85746378b5be7cc' 
  AND token = 'appZmtUO4twSh9IFO79PGRGbSPrB6OL9HYO2isvazrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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