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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd168fa18fc87db53967c7957bccfe2693ea99c009cd9bf3292371f4f65826cad' 
  AND token = 'Z2KZPCF+vHMy4RmENytMxzuaJ5Tk4Ixtu+H3QrrhC7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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