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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '212f70cd694cc72e0bdfc2ba2800ea1afa7c4ffb5ecca721936ce36e3966e11c' 
  AND token = 'QfOMT3ACdRvlhIz+wnwoh9knzVmJIKa9F/Vobcyr904=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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