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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f13916e73aaabe2bf9b003a12cfc08b79c857c95f3b1829fb452df1987707f87' 
  AND token = '7k+2vHJp5HjygJqojVDrrhKbJ7Z1mILpbrMfSiiACks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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