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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f6508901b221197528786bdafada8cfa5bafd1ddb30fe9a842a72d49526d813' 
  AND token = 'XuCq4IE8RSZ2MSlgF4NMpN5G2uStWVY1IZGfFDiSCpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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