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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3a111f67a4737f5f18a1618953029b117908cf7576ae3feeeb7990df5641a0e' 
  AND token = '/lqr8+TU47W6i6OvQpvjh44lAcq/UOyNx17W22f6M7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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