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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a31347a89bc909b0ef27e42f156c21bf358ef57f74b7ea7eff6de1617c38edd5' 
  AND token = 'HE8gW8H10kexkaxHtgmJks2xTPYQ7ACoGD3npEHnoPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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