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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '067d63f0dcdadc4d563cbd158aef3e3b60ddb9495ac47d81bf4b9d2df3db9a38' 
  AND token = 'uouP+045Ue4KR8IyaKn+hEqfnIs3S5dpv9/h8Jij0sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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