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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25665944972f4c69b55060fcc0507cc1b0f57d838d15be386c4bd920d26fafef' 
  AND token = 'dYtAHU7U5HUgXWcgQpwXRZJOfL40oVEaMJgN6JBnuzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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