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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70d4b5d39f309efb2e55a2f34823cce806071551cf75962028701687ed89d26c' 
  AND token = 'uM8C3Lnpi83EeSFnQRucgoFFZGqUg6LuPSBxj66ynpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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