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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1af5c11bd5fe15c38722c9f9a0f1ca0f5272ead3e91a55fba7138aee6fbac66' 
  AND token = 'QvMYhAkV7cXSrWm3Bk4DbgecZz42pUePKvcfImbuSDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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