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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3ddc061ddfa9740c2f52e6ab7a79a11ff69ebba82c8ca2c9de2356eea50d4fd' 
  AND token = '7k8K9p5Kh15yBjyWbXEmvODPfQKwztrXhuCWeg1DIJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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