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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71473eeccaf5b07bc37f26aa9d3a598521831d4c682fdea6a7f8cdc7ed290fd6' 
  AND token = '5WheP19yyeURY7HlBrz8MEEVFGsJ0gDUyHvf3NX5T10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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