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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bf2f3c1df8dd3d82ef62a0bdfc9506670f5d9b9630258bd5e214ee005ee1e41' 
  AND token = '/B6zCF5YfxRQ0xIRWj1DzKLozwylieLiCoI5tqhDllo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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