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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e07038947b17f91f6cc6976317335bcb4aa7fb18310a7713060e7fec93473698' 
  AND token = 'PfImhjbo/BeHNfxmktIIY7ZNfQFPyMYC3nf/NzZbGvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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