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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dafcec2f5f9e361bd631ae42c55321a3b315231769fecb241198b0e370ba479d' 
  AND token = 'mrPzhPZYbszsmc1iiJxLJonA1DyHOpPC3SJeGUc++NQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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