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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb23ef1fc1a4fb28240c9143e9a9b29d3a63301d81ae517590eff0486680b797' 
  AND token = 'xfTm1+fBciTlSe8vUQGXeVSexP4l+Srx9HcSypIVEd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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