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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99b4aa3954f662a6927eb121c1ef8bea7d897a1296d6223ea9b005a3e53f9aad' 
  AND token = 'z1SSqFpi1Y+C96cxnLPDitHR0M8wILF2K48lnV0G2/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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