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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '917e80361e0d8e0407a500d5f050de2d8d38caca967f4564e9b19df390cf141c' 
  AND token = 'jj10CAdfRT65s+r+CeseClsrcewA/OXmv8uG5NLRigY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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