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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eae8933adc9ae0edaf224b8c876cb0f00cd51717b324d9cb9e1101fed1c5add8' 
  AND token = '4bf6TPaf66ml/AA94Z3pP+VagfO45tML5AaMBYm21Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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