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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b78592225a0e037521df6988b9f511d3ce7dee198b3774201f6b6ddb3d88c847' 
  AND token = 'UhRkjXNgssEcQJ9rvIXGFdR+hdrVceUylGsLrtDqylE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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