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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e6c192337ac316a0ec55fc87821bc9b71e3a04c575d7172e32bcb21b14a6dee' 
  AND token = 'sJulpdQ1xCHP4K1dGdP+1qU5y3JJ8AYHSwf5b1JEQiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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