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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3710b693fcb48aa8892741e7163c77f577d1b15d240616d4baa78f8ca6560a65' 
  AND token = 'yVeOhn1g+Pb3CsCJTqRynMDAFjZBvfe3eEfu0z3m8ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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