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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '370634039566bea77a8b693fc974cf2b4e2f2902422c9e509971afcaff0fb1e5' 
  AND token = 'E1kptJ9tlr7Pu186nCYpDEgwdoKdhsaKcHBs9Umud9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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